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HD 202206 c
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 202206</td></tr><tr> <td colspan="2">Constellation</td> <td>Capricornus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>21h 14m 57.79s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−20° 47′ 20.1″</td></tr><tr><td colspan="2">Distance</td><td>151.14 ly
(46.3 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.55 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.267±0.021</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1383.4±18.4 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>78.99±6.65°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,250 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>42±1.5 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>2.44 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>November 16, 2004</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Correia et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 202206 c is an extrasolar planet discovered on November 16, 2004, using long-term observation of a formerly unconfirmed second planet after the discovery of a brown dwarf (first companion) around the star. This was the first circumbinary planet to be found around a main sequence star.

The planet orbits 3.07 times further out and is 7.13 times less massive than the first companion, having a semi-amplitude of only 42 m/s. Its mass is 2.44 times that of Jupiter and its diameter is roughly the same size as Jupiter's. The orbital resonance of the planet orbiting the brown dwarf is 5:1. The eccentricity of the planet is higher than that of all the planets and dwarf planets in our solar system except Eris, which has an eccentricity of 0.44.

References Edit

External links Edit

Coordinates: Sky map 21h 14m 57.79s, −20° 47′ 20.1″


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